using AutoMapper;
using BaseData.WriteApi.Appcontext.Command.Ewe_Files;
using MediatR;
using SmartTracking.Domain.HQX;
using SmartTracking.ErrorCode;
using SmartTracking.Infrastructure.Interfaces;

namespace BaseData.WriteApi.Appcontext.CommandHandler.Ewe_Files
{
    /// <summary>
    /// 母羊档案删除命令处理器（逻辑删除）
    /// </summary>
    public class DeleteEweFileCommandHandler : IRequestHandler<DeleteEweFileCommand, ApiResult<bool>>
    {
        private readonly IBaseRepository<EweFile> _eweRepository;
        private readonly IMapper _mapper;
        private readonly ILogger<DeleteEweFileCommandHandler> _logger;

        public DeleteEweFileCommandHandler(
            IBaseRepository<EweFile> eweRepository,
            IMapper mapper,
            ILogger<DeleteEweFileCommandHandler> logger)
        {
            _eweRepository = eweRepository;
            _mapper = mapper;
            _logger = logger;
        }

        /// <summary>
        /// 处理母羊档案删除命令（逻辑删除）
        /// </summary>
        /// <param name="request">母羊档案删除命令</param>
        /// <param name="cancellationToken">取消令牌</param>
        /// <returns>删除结果</returns>
        public async Task<ApiResult<bool>> Handle(DeleteEweFileCommand request, CancellationToken cancellationToken)
        {
            try
            {
                // 验证请求参数
                if (request == null)
                {
                    _logger.LogWarning("母羊档案删除请求参数为空");
                    return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = "请求参数不能为空", data = false };
                }

                // 验证数据
                if (!request.Validate(out string errorMessage))
                {
                    _logger.LogWarning($"母羊档案删除数据验证失败: {errorMessage}");
                    return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = errorMessage, data = false };
                }

                // 根据ID查询母羊档案
                var eweFile = await _eweRepository.GetByIdAsync(request.EweId);
                
                if (eweFile == null)
                {
                    _logger.LogWarning($"未找到ID为 {request.EweId} 的母羊档案");
                    return new ApiResult<bool> { Code = ApiEnum.查询失败, Message = "未找到指定的母羊档案", data = false };
                }

                // 检查是否已被删除
                if (eweFile.IsDeleted)
                {
                    _logger.LogWarning($"ID为 {request.EweId} 的母羊档案已被删除");
                    return new ApiResult<bool> { Code = ApiEnum.查询失败, Message = "母羊档案已被删除", data = false };
                }

                // 执行逻辑删除（更新IsDeleted状态）
                eweFile.IsDeleted = true;
                var result = await _eweRepository.UpdateAsync(eweFile);
                
                if (result > 0)
                {
                    _logger.LogInformation($"成功删除母羊档案，ID: {request.EweId}");
                    return new ApiResult<bool> { Code = ApiEnum.删除成功, Message = "母羊档案删除成功", data = true };
                }
                else
                {
                    _logger.LogError($"删除母羊档案失败，ID: {request.EweId}");
                    return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = "母羊档案删除失败", data = false };
                }
            }
            catch (ArgumentException ex)
            {
                _logger.LogWarning($"参数验证异常: {ex.Message}");
                return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = ex.Message, data = false };
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"删除母羊档案时发生系统异常: {ex.Message}");
                return new ApiResult<bool> { Code = ApiEnum.删除失败, Message = "系统异常，请联系管理员", data = false };
            }
        }
    }
}